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  本文選題：顯微光譜測量系統(tǒng)　切入點(diǎn)：TDSB納米線　出處：《河北大學(xué)》2017年碩士論文

【摘要】：本論文工作搭建了一套顯微熒光光譜測量系統(tǒng),將幾種測量采集功能巧妙地融合在一套實(shí)驗系統(tǒng)中,以TDSB有機(jī)單晶納米線為研究對象,利用該系統(tǒng)并結(jié)合穩(wěn)態(tài)熒光光譜技術(shù)和時間分辨光譜技術(shù)對納米線的穩(wěn)態(tài)熒光譜和熒光動力學(xué)進(jìn)行了測量,并分析TDSB納米線的熒光發(fā)射特性。本文主要內(nèi)容如下:搭建了顯微熒光光譜測量系統(tǒng),該光譜測量系統(tǒng)的結(jié)構(gòu)由飛秒激光器、光學(xué)多通道分析儀、時間相關(guān)單光子計數(shù)器與顯微光路構(gòu)成。該光譜測量系統(tǒng)實(shí)現(xiàn)了三大基本功能:(1)微觀樣品圖像采集功能可實(shí)現(xiàn)720倍的放大成像;(2)穩(wěn)態(tài)熒光光譜的采集功能可實(shí)現(xiàn)400~1000nm范圍的熒光采集;(3)瞬態(tài)熒光動力學(xué)信號采集功能最小時間分辨可至50ps量級;同時該系統(tǒng)在光譜采集過程中還具備較高的空間分辨能力其視場空間分辨最大可至整個TV視野,最小不超過直徑20um的圓周范圍。分別利用穩(wěn)態(tài)熒光光譜技術(shù)、時間分辨光譜技術(shù)對TDSB單晶納米線被DCM摻雜前后的熒光發(fā)光特性進(jìn)行研究。首先,采集了TDSB單晶納米線被DCM摻雜前后的穩(wěn)態(tài)熒光發(fā)射譜。結(jié)果表明,納米線的熒光發(fā)射峰從晶體到摻雜體中有所變化,TDSB的熒光特征峰位發(fā)生紅移,而且在由單晶體到摻有DCM濃度依次為5%、10%、15%的變化過程中,DCM的熒光峰位強(qiáng)度相對于TDSB熒光峰位強(qiáng)度逐步升高,這可能與納米線中主客體之間的能量傳遞有關(guān)。其次,采集了TDSB單晶納米線進(jìn)行DCM摻雜前后的熒光動力學(xué)信號。發(fā)現(xiàn)TDSB的特征波長處熒光壽命在單晶體中最大,隨著DCM摻雜濃度的升高,其熒光壽命呈現(xiàn)遞減趨勢,而DCM的熒光壽命則隨摻雜濃度的升高而呈增加趨勢,此結(jié)果表明納米線中存在著主客體間能量傳遞,并對能量轉(zhuǎn)移效率進(jìn)行了估算。最后,對摻雜體納米線的熒光傳播損耗性質(zhì)進(jìn)行了研究。結(jié)果表明,納米線不同波長的熒光傳播損耗系數(shù)有所不同,且隨波長增加而呈遞減趨勢;波長固定時熒光傳播損耗系數(shù)隨著摻雜濃度的升高而增加。
[Abstract]:In this paper, a set of micro-fluorescence spectrum measurement system is set up, and several measuring and collecting functions are skillfully fused into a set of experimental system. The TDSB organic single crystal nanowires are taken as the research object. The steady-state fluorescence spectrum and fluorescence kinetics of nanowires were measured by using the system, combined with steady-state fluorescence spectroscopy and time-resolved spectroscopy. The fluorescence emission characteristics of TDSB nanowires are analyzed. The main contents of this paper are as follows: a microscopic fluorescence spectrum measurement system is built. The structure of the system is composed of femtosecond laser, optical multichannel analyzer, and so on. The time dependent single photon counter and the microscopic optical circuit are constructed. The system realizes three basic functions: 1: 1) the image acquisition function of microscopic sample can realize 720 times magnification imaging and 2) the acquisition function of steady state fluorescence spectrum can be realized. The time resolution of transient fluorescence dynamic signal acquisition in 400~1000nm range is as low as 50ps. At the same time, the system also has high spatial resolution ability in the process of spectrum acquisition. The maximum spatial resolution of the field of view can reach the whole TV field of vision, and the minimum is not more than the circumferential range of the diameter 20um. The steady-state fluorescence spectrum technique is used, respectively. The fluorescence emission characteristics of TDSB single crystal nanowires before and after DCM doping were studied by time-resolved spectroscopy. Firstly, the steady-state fluorescence emission spectra of TDSB single crystal nanowires before and after DCM doping were collected. The fluorescence emission peak of nanowires changed from crystal to dopant, and the fluorescence characteristic peak of TDSB shifted red. Moreover, the fluorescence peak intensity of DCM gradually increased relative to that of TDSB, which may be related to the energy transfer between host and guest in nanowires. The fluorescence kinetic signals of TDSB single crystal nanowires before and after DCM doping were collected. It was found that the fluorescence lifetime at the characteristic wavelength of TDSB was the largest in single crystal, and the fluorescence lifetime decreased with the increase of DCM doping concentration. However, the fluorescence lifetime of DCM increases with the increase of doping concentration. The results show that there is energy transfer between host and guest in nanowires, and the energy transfer efficiency is estimated. The properties of fluorescence propagation loss of doped nanowires are studied. The results show that the fluorescence propagation loss coefficients of nanowires vary with wavelength and decrease with the increase of wavelength. The fluorescence propagation loss coefficient increases with the increase of doping concentration when the wavelength is fixed.
【學(xué)位授予單位】：河北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH744.1;TB383.1

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